JP4222231B2 - Masterbatch and masterbatch method - Google Patents

Description

  The present invention relates to a master batch and a master batch method for producing a resin containing a colorant.

There is a masterbatch method as one method for producing a resin containing a colorant (Patent Document 1, Patent Document 2, Patent Document 3, etc.). In this method, a master batch formed into pellets with a carrier resin containing a colorant (including surface adhesion) and natural resin pellets are put into a hopper and heated, kneaded and extruded by an extruder. . Considering that a masterbatch containing a colorant is diluted with a natural resin, the weight ratio of the natural resin to the masterbatch is referred to as a dilution factor, and it is "diluted XX times". For example, if the natural resin weight is 50 with respect to the masterbatch weight 1, it is said that the masterbatch is diluted 50 times, and such a masterbatch is referred to as a 50 times masterbatch. Naturally, a master batch with a high dilution ratio has a high concentration of colorant and a low content of carrier resin, and a master batch with a low dilution ratio has a low concentration of colorant and a high content of carrier resin. Therefore, when preparing a resin having the same color density, for example, a 10-fold master batch needs to use 5 times as much weight as a 50-fold master batch.
Japanese Utility Model Publication No. 2-24911 JP-A-7-102155 JP-A-11-279282

  The masterbatch is not always the same as the natural resin, but is often different, so if you use a masterbatch with a low dilution factor (high carrier resin content), The resin changes the physical properties of the natural resin, which is not preferable in terms of maintaining the physical properties of the kneaded resin.

  Moreover, since the material cost of a carrier resin is added to the material cost of an expensive colorant, the master batch becomes expensive when a master batch having a low dilution ratio (a high content of the carrier resin) is used. For example, a 10x masterbatch needs to use 5 times the weight of a 50x masterbatch as described above, but the price per unit weight of a 10x masterbatch is the price per unit weight of a 50x masterbatch. Higher than 1/5.

  Therefore, in order to maintain the physical properties of the resin and reduce the cost, it is effective to reduce the carrier resin by using a master batch having a high dilution ratio (for example, 50 times master batch). However, when a master batch having a high dilution ratio is used, there is a contradictory problem that uneven coloring easily occurs in the resin. The master batch with a high dilution ratio has a small number of pellets compared to the number of pellets of the natural resin, resulting in a sparse distribution, so it takes time for the colorant to diffuse from the master batch to the natural resin, and is limited in the extruder. This is because sufficient diffusion is difficult to obtain by kneading for a long time.

  For this reason, in reality, a master batch with a low dilution ratio (for example, a 25-fold master batch) is used to prevent uneven coloring, and there are many cases in which the physical property maintenance and cost reduction are slightly sacrificed.

  Therefore, it can be considered as a measure to prevent coloring unevenness while using a master batch with a high dilution ratio, by reducing the pellet unit weight of the master batch (Patent Document 2), that is, by reducing the size outside the pellet, This is to increase the number of pellets. In other words, the outside dimensions of the master batch are generally the same as the outside dimensions of the natural resin, but if you make it smaller than the outside dimensions of the natural resin, the corresponding amount (the total weight used remains unchanged). Since the number of pellets can be increased, the colorant is expected to be easily diffused by kneading.

  In addition, the pellet shape of the conventional masterbatch is generally a cylinder or a substantially spherical shape. In addition, a flat ellipse (Patent Document 1), an elliptic cylinder (Patent Document 2), a cube, a rectangular parallelepiped, a flake, a quadrangular pyramid ( Patent Document 3) and the like are disclosed. And the Example of patent document 2 is size reduction of an elliptic cylinder.

  However, when the inventor conducted a prior study, the masterbatch cylindrical or substantially spherical pellets were made smaller than the natural resin pellets, and when these were put into the hopper of the extruder, the small masterbatch pellets were The phenomenon that the pellets of the natural resin floated and gathered to the upper side by relatively sinking and gathering on the upper side, a phenomenon that both pellets are largely separated, that is, “classification” has occurred. When entering the extruder in a state where this classification has occurred, it is difficult to achieve uniformity even if the number of pellets in the masterbatch is large.

  An object of the present invention is to provide a masterbatch that can solve the above-described problems and obtain the contradictory effects of maintaining the physical properties and reducing the cost of the resin and preventing uneven coloring.

In the master batch of the present invention, in the pellet of the master batch at least 25 times comprising a high concentration colorant in the carrier resin, a meat stealing portion comprising a groove or a hole penetrating the pellet is formed on the outer surface of the pellet , The pellet unit weight after reduction by the meat stealer is 0.4 to 0.8 times the unit weight of the pellet when there is no meat stealer, and is relatively formed by the meat stealer. pellets outside dimensions of the virtual pellet form obtained by connecting the outer surface virtually parts, relative to the pellets outside dimensions of the mixing natural resin, in order to approximate to a degree causing no classification, cylindrical pellets shape Natural resin Or the sphere, the virtual pellet shape of the masterbatch is a cylinder or sphere with a length longer than the diameter, and the diameter of the latter cylinder or sphere with respect to the diameter of the former cylinder or sphere And characterized in that a 0.80 to 1.0 times.

The master batch method of the present invention is a master batch method in which pellets of at least 25 times the master batch comprising a high concentration colorant in the carrier resin and natural resin pellets are heated and kneaded with an extruder and extruded. In order to form a meat stealing part consisting of a hole penetrating a groove or a pellet on the outer surface of the master batch without substantially changing the outside dimension of the pellet of the master batch, the pellet unit after being reduced by the meat stealing part By making the weight 0.4 to 0.8 times the unit weight of the pellets when there is no meat stealing part, the number of pellets in the master batch is increased and formed relatively by the meat stealing part The pellet outside dimensions of the virtual pellet shape that virtually connects the outer surfaces of the projected parts to the outside dimensions of the natural resin to be mixed In order to approximate to the extent that classification does not occur, the pellet shape of the natural resin is a cylinder or sphere, the virtual pellet shape of the masterbatch is a cylinder or sphere having a length longer than the diameter, and the diameter of the former cylinder or sphere The diameter of the latter cylinder or sphere is 0.80 to 1.0 times . The resin that is extruded by heating and kneading with an extruder is not only a resin material for molding, but may be a resin product directly.

1. Concave meat stealing part (1) The shape of the meat stealing part is a hole penetrating the next groove or pellet that can form a relatively convex part .
b: Groove: A groove such as a straight line, a curved line, or an annular shape can be exemplified in a plane, and a groove such as a V shape, a U shape, an arc shape, or a rectangular shape can be exemplified in a cross section.
c: Hole: A concave portion such as a circle, an ellipse, a rectangle, and an irregular shape can be exemplified in a plane, and a hole penetrating the pellet and a hole where the plurality of holes intersect can be exemplified in a cross section.
(2) The number of meat stealers is not particularly limited, and may be one or two or more.
(3) The reason why the pellet unit weight after reduction by the meat stealer is 0.4 to 0.8 times the unit weight of the pellet when there is no meat stealer is less than 0.4 times easily cracked pellets of the master batch, the effect of increasing the number of pellets of the masterbatch exceeds 0.8 times is because lower.

2. Relationships former pellets outside dimension of the pellet outside dimensions and natural resin of the master batch to "Ru is approximated to a degree that does not cause classification" for the latter, the next pellet shape and dimensional relationship.
(1) The pellet shape of the natural resin is a cylinder (provided that the length is longer than the diameter), and the virtual pellet shape of the master batch is a cylinder (provided that the length is greater than the diameter) or a substantially spherical shape der is, in order to latter pellets does not pass between the former pellets, the length of the former cylinder (but not limited, 1.5 to 5 mm is suitable) of the latter cylinder or against the diameter of the sphere Ri 0.80 to 1.0 Baidea, and more preferably 0.90 to 1.0 times.
(2) a natural resin pellet shape substantially spherical, virtual pellet of the masterbatch cylindrical (however, the cylinder is greater in length than the diameter) or Ri approximately spherical der, for the same reason as above (1) , (but not limited, 1.5 to 5 mm is suitable) of the former sphere diameter diameter of the latter cylinder or sphere for the Ri 0.80 to 1.0 Baidea, 0.90 to 1 More preferably, it is 0.0 times.

3. Manufacturing method of masterbatch The manufacturing method of the masterbatch according to the present invention is not particularly limited. For a virtual pellet shape having a columnar shape, for example, a known strand cutting method is used, and the virtual pellet shape is substantially spherical. Can be produced by using methods such as water cut and hot cut.

4). Masterbatch Carrier Resin The type of carrier resin for the masterbatch is not particularly limited, and may be the same or different from those compatible with the natural resin.

5. Masterbatch Colorant The type of colorant in the masterbatch is not particularly limited. The concentration of the colorant is 25 times even without low, yet in a relatively high concentration of the master batch of 50 times or more, the present invention is particularly effective.

  According to the master batch according to the present invention, it is possible to obtain the contradictory effects of maintaining the physical properties and reducing the cost of the resin and preventing coloring unevenness.

In a pellet of at least 25 times the master batch comprising a high concentration of colorant in the carrier resin, a meat stealing portion comprising a groove or a hole penetrating the pellet is formed on the outer surface of the pellet, and after reduction by the meat stealing portion The pellet unit weight is 0.4 to 0.8 times the unit weight of the pellet when there is no meat stealing portion, and the outer surface of the convex portion formed relatively by the meat stealing portion is virtually connecting the pellets outside dimensions of the virtual pellet for pellets outside dimensions of the mixing natural resin, in order to approximate to a degree causing no classification, the pellet of Na Churarurejin a cylindrical or approximately spherical, masterbatch virtual pellet shape cylindrical (however, a large and cylindrical length than diameter) and or approximately spherical, earthenware pots by the latter of the pellets does not pass between the former pellets, the former It was from 0.80 to 1.0 times the diameter of the latter cylinder or sphere with respect to the diameter of the cylinder or sphere.

  First, FIG. 1 shows some examples of a master batch 1 in which the virtual pellet shape is a cylinder, and a concave meat stealing portion 2 is formed on the outer surface of the cylinder pellet to reduce the pellet unit weight. The external pellet size of the virtual pellet formed by virtually connecting the outer surface of the convex portion 3 relatively formed by the meat stealing portion 2 as indicated by a two-dot chain line is compared with the external pellet size of the natural resin to be mixed. Thus, it is approximated to such an extent that classification does not occur.

  The master batch 1 of Example a in FIG. 1 has two cross-section V-groove meat stealing portions 2 formed at two positions every 180 degrees on the columnar surface of the column, and the end surface of the column is substantially drum-shaped. This is an example. The master batch 1 of Example b is an example in which the meat stealing portion 2 having a V-shaped cross section is formed at four positions every 90 degrees on the columnar surface of the column, and the end surface of the column has a cross shape. The master batch 1 of Example c is an example in which the end face of the cylinder is formed into a star pentagon by forming the meat stealing portions 2 having a V-shaped cross section at five locations every 72 degrees on the column surface of the cylinder. . The master batch 1 of Example d is an example in which the meat stealing portion 2 having a V-shaped cross section is formed at eight positions every 45 degrees on the columnar surface of the cylinder, and the end surface shape of the cylinder is a star octagon. .

  The master batch 1 of Example e is an example in which a meat stealing portion 2 having a U-shaped cross section is formed in one place on a columnar surface of a column, and the end surface of the column is substantially C-shaped. In the master batch 1 of Example f, a hole-shaped meat stealing portion 2a is formed from the center of the end face of the cylinder, and a slit groove-shaped meat stealing portion 2b continuous with the meat stealing portion 2a is formed at one place on the pillar surface. In this example, the end face shape of the cylinder is C-shaped. The master batch 1 of Example g is an example in which a hole-shaped meat stealing portion 2 is formed from the center of the end face of the cylinder, and the end face shape of the cylinder is a ring shape.

  The master batch 1 of Examples a to g can form the meat stealing portion 2 in the die hole 11 of the die 10 as shown in FIG. It can be easily manufactured by forming a substantially drum shape and cutting the strand material discharged from the die hole 11.

  Next, FIG. 2 shows some examples of the master batch 1 in which the virtual pellet shape is substantially a sphere, and a concave meat stealing portion 2 is formed on the outer surface of the sphere pellet to reduce the pellet unit weight. A natural resin that mixes the outside dimensions of a virtual pellet shape (substantially sphere) in which the outer surface of the convex portion 3 formed relatively by the meat stealing portion 2 is virtually connected as indicated by a two-dot chain line It is approximated to the extent that classification does not occur with respect to the outside dimensions of the pellets.

The master batch 1 of Example h in FIG. 2 is an example in which two meat stealing portions 2 having U-shaped cross sections are formed at two locations on a spherical surface every 180 degrees. The master batch 1 of Reference Example i is an example in which circular concave-shaped meat stealing portions 2 are formed at four locations on a spherical surface every 90 degrees. The master batch 1 of Reference Example j is an example in which a deformed valley-like meat stealing portion 2 is formed at a large number of locations on a spherical surface to form a star polyhedron (gold flat sugar shape).

The master batch 1 of Example h uses a known water cut or hot cut, forms a die hole (not shown) in a shape that can form the meat stealing portion 2, and discharges the material discharged from the die hole. It can be manufactured by cutting. The master batch 1 of Reference Examples i and j can be manufactured by molding.

Each masterbatch 1 of the above Examples a to h and Reference Examples i and j is a 50 times masterbatch containing a high concentration of colorant in the carrier resin, and the diameter of a cylinder or a substantially sphere having a virtual pellet shape is It is 0.80-1.0 times with respect to the diameter of the cylinder of the pellet of the natural resin to mix, or a substantially spherical shape. Moreover, each pellet unit weight is reduced by 0.4 to 0.8 times by the meat stealing unit 2 with respect to the unit weight of the pellet when the meat stealing unit 2 is not provided. The most preferable example is that the diameter of a cylinder or substantially sphere that is a virtual pellet shape is 0.9 to 1.0 times (equal to) the diameter of the cylinder or substantially sphere of a natural resin pellet to be mixed, and Each pellet unit weight is reduced by 0.4 to 0.6 times by the meat stealing unit 2 with respect to the unit weight of the pellet when the meat stealing unit 2 is not present.

According to these master batches 1 of Examples a to j, the following effects are obtained.
(1) By reducing the carrier resin in a master batch having a high dilution ratio (high colorant concentration and low carrier resin content), the physical properties of the molding resin material can be maintained and the cost can be reduced.
(2) By forming the meat stealing portion 2 on the pellet outer surface of the master batch 1 and reducing the pellet unit weight, the number of pellets is increased to improve the diffusibility of the colorant, and uneven coloring of the resin material for molding Can be prevented.
FIG. 4 shows an image in which a masterbatch having the same outside dimension of pellets and a carrier resin are mixed.
FIG. 5A shows an image of the master batch 1 50 times that of Example a in which the pellet unit weight is reduced by 0.5 times due to the meat stealing portion, and the master batch 1 for 50 pellets of the carrier resin 5. Since two pellets are mixed, the diffusibility of the colorant is good.
On the other hand, FIG. 5B is an image of the master batch 21 that is 50 times the conventional size without the meat stealing portion. One pellet of the master batch 21 is mixed with 50 pellets of the carrier resin 5. Therefore, the diffusibility of the colorant is poor.
FIG. 10C is an image of the master batch 22 that is 25 times the conventional size without the meat stealing part, because the number of pellets of the master batch 22 is mixed with the number of pellets of the carrier resin 5. The diffusibility of the colorant is good, but since there are many carrier resins, the physical properties of the resin material for molding change and the cost increases.
(3) By approximating the external pellet size of the virtual batch shape of the master batch to the natural resin pellet size so as not to cause classification, classification is prevented and the action of (2) above is not diminished. Can be.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

It is a perspective view which shows the masterbatch of Example ag which concerns on this invention. It is a perspective view of the die | dye used for manufacture of the masterbatch of Example a. It is the perspective view and sectional drawing which show the masterbatch of Example h which concerns on this invention, and the reference examples i and j . It is the schematic which shows the mixing image of a masterbatch and a natural resin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Masterbatch 2 Meat stealing part 2a Meat stealing part 2b Meat stealing part 3 Convex part 5 Carrier resin 10 Dice 11 Die hole

Claims (2)

In at least 25 times the masterbatch pellets containing a high concentration of colorant in the carrier resin ,
A meat stealing portion comprising a groove or a hole penetrating the pellet is formed on the outer surface of the pellet, and the pellet unit weight after reduction by the meat stealing portion is 0 with respect to the pellet unit weight when there is no meat stealing portion. .4 to 0.8 times ,
The virtual pellet-shaped pellet outer dimensions that virtually connect the outer surfaces of the convex portions formed relatively by the meat stealing portion are approximated to such an extent that classification does not occur with respect to the natural resin pellet outer dimensions to be mixed. in order to, the pellet form of the natural resin is a cylindrical or spherical, the masterbatch virtual pellet shape and a large cylindrical or spherical length than the diameter of the latter cylinder or sphere with respect to the diameter of the former cylinder or sphere A master batch characterized in that the diameter is 0.80 to 1.0 times . In a masterbatch method of extruding at least 25 times the masterbatch pellets containing a high concentration colorant in a carrier resin and natural resin pellets by heating and kneading with an extruder,
Without substantially changing the outside dimensions of the masterbatch pellets, a meat stealer consisting of grooves or holes penetrating the pellets is formed on the outer surface of the masterbatch pellets to reduce the pellet unit weight after reduction by the meat stealer. By increasing the number of pellets in the master batch by 0.4 to 0.8 times the unit weight of the pellets when there is no meat stealing part ,
The virtual pellet-shaped pellet outer dimensions that virtually connect the outer surfaces of the convex portions formed relatively by the meat stealing portion are approximated to such an extent that classification does not occur with respect to the natural resin pellet outer dimensions to be mixed. Therefore, the pellet shape of the natural resin is a cylinder or sphere, the virtual pellet shape of the masterbatch is a cylinder or sphere having a length longer than the diameter, and the diameter of the latter cylinder or sphere is larger than the diameter of the former cylinder or sphere. Is 0.80 to 1.0 times, a master batch method.

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